Exterior, House, Metal, Flat, Brick, Glass, and Mid-Century In the entrance, a team with the general contracting firm Martha uncovered an abstract mural that Engels painted himself and then plastered over. He also made the geometric door handle. Simon speculates that Engels sourced the marble, found all over the house, from Expo ’58, after the pavilions had been dismantled.  Best Exterior Mid-Century Glass Photos from A Major Restoration Updated This Midcentury Landmark in Belgium